AM3359: Power Estimation

Manikandan M M

Part Number: AM3359

I am using AM3359 Sitara Processor in the design. DDR3L of 1GB density with data lines of x16 is interfaced. It has two I2C, UART and SPI interface and GPMC is used to communicate with NAND Flash, NOR Flash and FPGA (16-bit). It has 1Gbps RGMII Ethernet interface as well. Kindly verify the Power Estimation Excel for the following configuration. As the VDDS_DDR is less than 10mA. Is there any settings, am I missing?

report-am335x_pet_input.xls

Is it okay to use independent Switching Regulators instead of PMIC? Is it okay to combine VDDS_RTC and VDD_CORE?

Is there any voltage restrictions for the particular operating speed, Like 1Gbps Ethernet shall operate in 1V8 voltage mode not in 3V3 mode?

over 1 year ago

0 Colin Callaghan over 1 year ago

TI__Expert 8275 points

Hi Manikandan,

Manikandan M M said:
Is it okay to use independent Switching Regulators instead of PMIC?

Yes it is. We have a PMIC selection guide you can reference, but you specifically requested non PMIC solutions which might not apply in the below App Note. Switching supplies will suffice, so long as the customer follows the Power Sequencing requirements as detailed in the Datasheet.

https://www.ti.com/lit/an/slvaee2a/slvaee2a.pdf

Manikandan M M said:
Is it okay to combine VDDS_RTC and VDD_CORE?

No. Please review the Power Sequence Requirements of the Datasheet. They also require different voltage levels.

Manikandan M M said:
Is there any voltage restrictions for the particular operating speed, Like 1Gbps Ethernet shall operate in 1V8 voltage mode not in 3V3 mode?

The voltage/frequency requirements are first mentioned in the OPP Tables, 5-8 and 5-9 in the datasheet. You cannot run 1Gbps in OPP50 or slower.

Manikandan M M said:
As the VDDS_DDR is less than 10mA. Is there any settings, am I missing?

6mW may or may not be appropriate for your target power mode, but that is notably less than any active power mode characterized and summarized in the attached Power Consumption Summary attached below:

/cfs-file/__key/communityserver-discussions-components-files/791/0116.AM335-Power-Consumption-Summary.pdf

Regards,

Colin

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AM3359: Power Estimation